LED heat sinks
Finned aluminium heat sinks and star/PCB-mount bases that hold junction temperatures down for high-bay, street and panel luminaires.
Lighting & Thermal Management
Aluminium LED Heat Sink Die Casting
Net-shape aluminium LED heat sinks, garden & outdoor luminaire bodies and flame-proof fittings — cast, machined and coated under one ISO 9001:2015 roof. We engineer dense, leak-tight castings that pull heat away from the LED and last in the field.
Why die-cast aluminium
Built to move heat, not just hold it
An LED converts a large share of its drive power into heat, and junction temperature decides both light output and service life. The heat sink has to conduct that energy out efficiently — which is exactly where pressure die-cast aluminium earns its place over plastics and steel.
- High thermal conductivity. Aluminium spreads heat away from the LED far faster than steel or filled plastics, keeping junction temperatures in check.
- Net-shape fins. Tall, thin, closely-pitched cooling fins are cast directly into the part — surface area you could not machine cost-effectively.
- Cost at volume. Once tooled, each shot reproduces the same geometry repeatably, so unit cost drops sharply as quantities rise.
- Durability. A cast aluminium body resists outdoor exposure, vibration and thermal cycling better than pressed or moulded alternatives.
We bring Design-for-Manufacture input early — reviewing fin draft, wall sections and gating against your thermal drawing before any steel is cut. See the full process on our pressure die casting page.
Alloys for thermal & leak-tight parts
The right grade for the job
Heat sinks and luminaire bodies reward fluid, thin-section alloys that fill intricate fins and stay leak-tight outdoors. We cast the full BS 1490 LM-series — these are the grades we reach for most.
| Alloy | Chemistry | Why it suits lighting |
|---|---|---|
| LM6 | Al-12Si (eutectic) | Excellent fluidity for thin, intricate fins; leak-tight and corrosion-resistant — ideal for outdoor fittings. |
| LM20 | Al-12Si | The pressure-die equivalent of LM6 — thin, intricate, leak-tight castings at volume. |
| LM24 | Al-8.5Si-3.5Cu | The PDC workhorse — strong, dimensionally stable bodies and housings for general lighting. |
Final selection depends on wall thickness, finish and your thermal target. Use the interactive aluminium die casting alloy guide to compare grades, or share your drawing for a confirmed recommendation.
Lighting parts we make
From street poles to flame-proof fittings
Garden & outdoor lighting
Bollard, post-top and floodlight bodies built to shrug off weather, UV and thermal cycling year after year.
Flame-proof fittings
Robust, pressure-tight enclosures and fittings for industrial and hazardous-area lighting where integrity is critical.
In-house machining & finishing
Fit, sealing and corrosion resistance — handled here
A heat sink only performs if it mates flat to the LED board and resists the environment it lives in. We complete every part in-house, so it ships finished, inspected and ready to assemble.
- CNC machining of mounting faces, bores and tapped holes brings each casting to final tolerance for a flat thermal interface. More on our CNC machining page.
- Shot blasting plus powder or primer coating gives a clean, durable, corrosion-resistant surface for outdoor and industrial fittings.
- Stage-wise inspection to ISO 9001:2015, with material and dimensional documentation and certificates of conformance on request.
Black or specified RAL coatings, masking of sealing faces and leak considerations are all confirmed against your part and drawing.
Export-ready supply
Shipping lighting castings worldwide
We supply both domestic Indian OEMs and global lighting buyers. Castings are packed sea-worthy with corrosion protection and shipped on standard Incoterms (EXW / FOB / CIF) from our nearest gateway port, Nhava Sheva (JNPT), with full export documentation and RoHS / REACH declarations on request.
See how we support international buyers on our export aluminium castings page, then send your destination, target volume and Incoterm for a tailored quote.
Start your project
Send your heat sink drawing for a free quote
Share a 2D drawing or 3D/CAD file with your alloy, finish and volume — we reply with a feasibility review, usually within one business day. You can also inspect a part in our free 3D viewer.